Venom (2018)

Continuity mistake: When Anne breaks up with Eddie on the sidewalk right after they get fired from their jobs, she approaches him and drops the box she is carrying. A ceramic mug falls out of the box. There is both visual and audible confirmation. After putting her ring in his shirt pocket, she bends to pick up the empty box and proceeds to walk away without also retrieving the missing contents. (00:14:45)

Venom: You come in here again, in fact, you go anywhere in this city preying on innocent people and we will find you and eat both your arms and then both of your legs and then we will eat your face right off your head. Do you understand?
Robber: Please.
Venom: Yes. So, you will be this armless, legless, faceless thing, won't you? Rolling down the street, like a turd in the wind. Do you feel me?
Robber: What the hell are you?
[Venom's face partially opens to reveal Eddie's face]
Eddie/Venom: We...are Venom.
[Venom's face fully reforms]
Venom: On second thought.
Robber: Please.
[Venom kills the robber].

Trivia: When Ann and Eddie are on their date, Ann reminds Eddie of his firing from the Daily Globe. In the Spider-Man comics, Eddie Brock was a reporter for the Daily Globe, a rival newspaper of the Daily Bugle. In the comics, a string of murders were being carried out by a serial killer named the Sin-Eater. Eddie interviewed a man who claimed to be the Sin-Eater but Spider-Man captured the real one and the man that Eddie interviewed was found out to be a compulsive confessor. This incident caused Eddie to get fired from the Daily Globe and sometime after becoming Venom, moves to San Francisco after agreeing with Spider-Man that they will not bother each other on the condition that Eddie no longer commits any more crimes.

Question: When Eddie goes to see Dan about the test results, Dan says that the symbiote is damaging Eddie's organs but Venom says it's part of the symbiosis. Was Venom really damaging Eddie's body? If not, what was he really doing?